Improvements in or relating to devices for producing involute or modified involute tooth-profiles on gear grinding discs

摘要

569,081. Trueing grinding wheels. AEPPLI, A. June 23, 1943, No. 10155. Convention date, June 11, 1942. [Class 60] A grinding-wheel N having an involute tooth profile for gear grinding, has the profile trued by means of a diamond operated through a lever mechanism from a rolling device ; the profile also may be formed as a modified involute form to produce correspondingly modified gear teeth. A support 20 is-secured to the bed of the grinding-machine and carries, in a bearing 21, a rotatable pin 1 secured to a carrier 3 having two perforated ears in which a rectilinear rolling member 5 is guided; the member 5 is connected by rolling strips 6, 7 to a rolling segment 2 mounted, coaxially with the pin 1, on the support 20. On the carrier 3 is a slideway 9, at right-angles to the member 5, carrying an adjustable slide 8 in which is a transverse slideway 10 for a plunger 11 on which is mounted adjustably, by means of a turntable 22 and screw 23, a holder 24 for the diamond trueing-tool 12. The carrier 3 also has secured thereon a support 14 in which is an axle pin 13 carrying a roller 25 and guide-pieces 16 against which is pressed a rail 15 by means of springs 18 and a cross-piece 17 ; the rail serves as a two-armed lever fulcrummed about the pin 13, its outer ends engaging similar rollers 25 &c. on the parts 5, 11, respectively. The wheel N is trued by oscillation of the carrier 13 about the pin 1, the diamond having been set with its point on a circle do equal to the pitch circle of the involute curve. For the production of a modified involute curve the lower end of the rail 15 is curved as at 151, Fig. 6, or, alternatively, a cam effects contact between the members 5 and rail 15. In place of the rolling segment &c. a toothed sector co-operating with a rack may be employed. The device may be used in the rectifying of grinding-discs intended for grinding screw gears. Involutes on any desired pitch circle are produced by adjustment of the slide 8, so that the ratio of the arms of the rail 15 is equal to that of do, the desired pitch circle diameter, to Do, the diameter of the segment 2.